摘要
寒区岩体破坏主要与结构面力学特性及冻融损伤相关。为探究冻融作用下砂岩结构面的强度特性,采用小圆弧刀头劈裂制备贯通结构面,对其进行了冻融循环及剪切试验,得到了结构面的剪切强度、内聚力及内摩擦角的劣化规律。试验结果表明:小圆弧刀头制备的结构面完整、均一,且上下盘吻合度高;岩石的峰值剪切强度与冻融次数呈负相关,与法向应力呈线性正相关;随着冻融循环次数的增加,内聚力减小趋势变缓,内摩擦角无明显变化趋势。研究结果对寒区岩体强度特性分析具有参考价值。
The rock mass damage in cold areas is mainly related to the mechanical properties of the structural plane and the freeze-thaw damage. In order to explore the strength characteristics of sandstone structural plane under freezing and thawing, this paper adopted small arc cutter head splitting to prepare the through-structure plane, and conducted the freeze-thaw cycle and shear test to obtain the deterioration regular pattern of shear strength, cohesion and internal friction angle of the structural plane. The test results show that the structural plane prepared by the small circular arc head is complete and uniform, and the upper and lower discs are in highly degree of coincidence;and the peak shear strength of the rock is negatively correlated with the number of freeze-thaw cycles, and is linearly positively correlated with the normal stress. As the number of freeze-thaw cycles increases, the cohesive force decreases and the internal friction angle does not change significantly. The research results have a reference value for the analysis of rock mass strength characteristics in cold regions.
作者
杨小敏
熊梦馨
罗学东
王一洋
Yang Xiaomin;Xiong Mengxin;Luo Xuedong;Wang Yiyang(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;Wuhan Times Architectural Design Co.,Ltd.,Wuhan 430013,China)
出处
《地质科技情报》
CAS
CSCD
北大核心
2019年第6期251-255,共5页
Geological Science and Technology Information
基金
国家自然科学基金项目(41572281)
关键词
冻融循环
人工劈裂砂岩结构面
剪切强度
内聚力
内摩擦角
freeze-thaw cycle
artificial split sandstone structural plane
shear strength
cohesion
internal friction angle
